Vibration Measurement Method of a String in Transversal Motion by Using a PSD

Yang, Che‐Hua; Wu, Tai Chieh

doi:10.3390/s17071643

Cited by 10 publications

(6 citation statements)

References 20 publications

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“…Due to this non-uniformity in the current distribution between the anode and the cathode, a change in current, designated as the lateral effect, can occur [33]. This lateral effect has been studied and exploited in sensors that detect the position of a laser beam by measuring the current variation between opposing anodes and a common cathode [34][35][36]. A systematic measurement across all quadrants for all used laser wavelengths was conducted, yielding consistent results across the board.…”

Section: Resultsmentioning

confidence: 99%

Design and construction of an affordable optical power meter: micro- to milli-Watt in the 400–800 nm range

dos Santos Jr,

Andrade,

Silva

et al. 2024

Meas. Sci. Technol.

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This study introduces the design, construction, and evaluation of an affordable optical power meter prototype, AYR (Affordable Yet Reliable) version 1.0, which operates effectively within the 400-800 nm range, using a silicon photodiode. Aimed at bridging the gap in accessibility to precise and reliable photonics instrumentation, especially in resource-constrained settings, AYR 1.0 leverages advancements in photodiode technology, additive manufacturing, and do-it-yourself electronics. The device incorporates a custom-built electronic circuit that facilitates accurate optical power measurement by converting light into electrical current. Through rigorous testing against a reliable commercial optical power meter, AYR 1.0 demonstrated exceptional accuracy and reliability. Sensitivity values ranged from ~13 µA/mW at 405 nm to ~796 µA/mW at 805 nm. The operational power range spanned from 0.003 mW to 242.0 mW, with linearity (R²) values consistently above 0.9981, indicating high fidelity in measurement. Repeatability percentages varied between 99.4% and 99.9%, and response times ranged up to 55 µs, showcasing the prototype's rapid and reliable response to changes in optical power. The key components include a low-cost silicon photodiode (2DU10), a differential trans-impedance amplifier circuit for signal processing, and a 3D-printed housing for the sensor head and console, contributing to its cost-effectiveness and robustness. The prototype's total cost was 116 US dollars, highlighting its affordability and potential for widespread adoption.

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Section: Resultsmentioning

confidence: 99%

Design and construction of an affordable optical power meter: micro- to milli-Watt in the 400–800 nm range

dos Santos Jr,

Andrade,

Silva

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

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“…PSD is utilized for visual servoing and control applications [2]. Yang and Wu [4] used PSD for measuring a string vibration primarily due its fast response time. Qu et al [3] applied PSD-based position detection system for a closedloop control of a solar tracking mobile robot.…”

Section: Background and Related Workmentioning

confidence: 99%

“…Position sensitive detectors (PSDs) have become one of the most important components in the 2 or 3 degree-offreedom (DoF) position tracking system for various applications [1,2,3,4] (e.g., primarily based on lasers for measuring distance, displacement, and vibration), for which they provide high position resolution, fast response time, while being rather cost-effective and requiring simple signal conditioning circuits.…”

Section: Introductionmentioning

confidence: 99%

A Wide-area, Low-latency, and Power-efficient 6-DoF Pose Tracking System for Rigid Objects

Kim¹,

Kapoor²,

Mansi³

et al. 2021

Preprint

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Position sensitive detectors (PSDs) offer possibility to track single active marker's two (or three) degrees of freedom (DoF) position with a high accuracy, while having a fast response time with high update frequency and low latency, all using a very simple signal processing circuit. However they are not particularly suitable for 6-DoF object pose tracking system due to lack of orientation measurement, limited tracking range, and sensitivity to environmental variation. We propose a novel 6-DoF pose tracking system for a rigid object tracking requiring a single active marker. The proposed system uses a stereo-based PSD pair and multiple Inertial Measurement Units (IMUs). This is done based on a practical approach to identify and control the power of Infrared-Light Emitting Diode (IR-LED) active markers, with an aim to increase the tracking work space and reduce the power consumption. Our proposed tracking system is validated with three different work space sizes and for static and dynamic positional accuracy using robotic arm manipulator with three different dynamic motion patterns. The results show that the static position root-mean-square (RMS) error is 0.6 mm. The dynamic position RMS error is 0.7-0.9 mm. The orientation RMS error is between 0.04 • and 0.9 • at varied dynamic motion. Overall, our proposed tracking system is capable of tracking a rigid object pose with sub-millimeter accuracy at the mid range of the work space and sub-degree accuracy for all work space under a lab setting.

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“…The proper extraction of spectral features is crucial in earthquake event recognition as the core component of seismic monitoring 4 . Power Spectral Density (PSD) is commonly employed to extract earthquake signal frequencies 5 . However, the presence of disturbances such as high-frequency noise can result in PSD containing multiple peaks, thus making it challenging to identify the vibration signal frequency generated by earthquake excitation 6 .…”

Section: Introductionmentioning

confidence: 99%

Spectrum feature extraction method combining Allan variance, VMD, and PSD

Liu,

Wang,

Liu

et al. 2024

Sci Rep

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Spectrum feature extraction plays a crucial role in identifying seismic events and calculating structural response parameters. However, the criteria for identifying effective modal components in Variational Mode Decomposition (VMD) are not well-defined, resulting in inaccurate spectrum feature extraction. To address this issue, we propose a novel spectrum feature extraction method that combines Allan variance, VMD, and power spectral density (PSD). Firstly, VMD is applied to filter noise components from triaxial accelerometer observations and add effective signals. Secondly, PSD is utilized to extract three groups of seismic frequencies (tri-axial accelerometers). Finally, the Allan method is introduced to identify the group of accelerometer observations with the highest reliability as the vibration frequency caused by the seismic excitation. We validate the effectiveness of our method by analyzing a Mw 2.6 micro-seismic event that occurred in Huairou, Beijing in 2022. The result shows that our proposed method accurately extracts spectrum features of the Great Wall. Specifically, the seismic excitation vibration frequencies at four monitoring stations were found to be 26.95 Hz, 12.89 Hz, 12.89 Hz, and 12.5 Hz. These findings underscore our method's utility in evaluating the Great Wall's structural response to seismic loading, which has significant implications for the conservation and protection of heritage structures.

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Vibration Measurement Method of a String in Transversal Motion by Using a PSD

Cited by 10 publications

References 20 publications

Design and construction of an affordable optical power meter: micro- to milli-Watt in the 400–800 nm range

Design and construction of an affordable optical power meter: micro- to milli-Watt in the 400–800 nm range

A Wide-area, Low-latency, and Power-efficient 6-DoF Pose Tracking System for Rigid Objects

Spectrum feature extraction method combining Allan variance, VMD, and PSD

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